Hot-air furnace



(No Model.)

B. W. FELTON.

HOT AIR FURNACE. No. 313,065. J Patented Mar. 3, 1885.

WITNESSES INVENTBH Unrrnn States Patent rrrcie.

BENJAMIN V. FELTON, OF BOSTON, MASSACHUSETTS.

HOT-Al R FURNACE.

:j'Zl-EOIFZUATION arming part of Letters Patent No. 313,065, dated March 3, 1885.

Application filed March 31, 15-34. (No model.)

To aZZ whom it may concern.-

Be it known that I, BENJAMIN W. Fn tires,

a citizen of the United States, residing at Bos-.

ton, in the county of Suffolk and State of Mas sachusetts, have invented certain Improve ments in Hot-Air Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanyin g drawings, making part of this specification, in which' Figure l is a vertical section through a hotair furnace constructed in accordance with my invention. Fig. 2 is a perspective view of the same, with a portion of the outer casing removed. Fig. 3 is a horizontal section on the line it x of Fig. 1.

My invention relates to certain improvenlents in the construction of hot-air furnaces, whereby .the upward currents of cold air, which enter the hot-air chamber near its bottom, are heated on all sides in their ascent; and my invention has for its object to prevent the upward currents of air from passing be tween the outside of the radiator and the inner side of the outer casing or wall of the furnace, and also to enable the height of the furnace to be reduced, whereby a greater inclination can be given to the hot-air pipes.

To this end my invention consists in extend ing an annular radiator out to the inside of the outer casing or wall, so that it will lie close thereto around its entire periphery, in order to prevent the upward currents of air from passing between the two, whereby the entire volume of ascending air is compelled to pass between hot surfaces on each side, and its cir culation or upward force thus materially increased.

In the said drawings, A represents the dome or combustion-chamber of a hotair furnace; B, the fire-pot; G, the ash-pit, and D the hotair chamber, from the upper portion of which extend the ordinary hot-air pipes, E, to the apartments to be warmed, and near the bottom of the hot-air chamber is the usual opening, 11, in the outer casing G, through which the air from the cold-air box is admitted.

H is an annular radiator which encircles the dome or combustionchamber A below the level of its top, at such distance therefrom as to leave an annular space, 0, between the two, through which the upward currents of air pass from the lower to the upper portion of the hotair chamber D, and thence to the hot-air pipes E. The annular radiator H extends outward, so as to lie closely against the inner surface of the outer casing, G, thereby preventing the passage of any air whatever between the two, and consequently the entire volume of ascending air is compelled to pass through the space 0, in contact with highlyheated surfaces on all sides, thus greatly increasing the circulation or ascending force of the aincurrents; whereas if the upward currents of air were allowed to pass between the outside of the radiator and the cool surface of the outer casing, G, their force would be checked r neutralized by descending air-currents, and the efficiency of the furnace thus greatly impaired.

The annular radiator H. communicates at its opposite ends, 5 6, with the mouth-piece I, through which the fuel is introduced to the furnace, as seen in Fig. 3, and on one side of this mouth-piece the radiator is provided with an enlargement, (1, having an aperture, e,1eading directly to the chimney-flue, a damper, f, being placed between the open end: 5 of the radiator H and the chimney flue, which damper, when closed, causes the hot air and products ofcombustion to enter the open end 6 of the radiator and pass entirely around the same to the aperture 6, and thence into the chimney, whereby the radiator is intensely and rapidly heated as required, and the upward currents of air thus heated to a high degree by contact with the bottom, inner side, and top of the radiator on one side and the outer surface of the firepot and combustionchamber on the other side.

By the employment of an annular radiator constructed and arranged as shown I am enabled to utilize the heat to its greatest extent,

and thus effect a material saving in fuel, while by preventing any air from passing between the outside of the radiator and the inner surface of the outer casing all interference with the upward currents of air by opposing aircurrents having a tendency to descend is avoided, thus causing the furnace to operate to much better advantage under all conditions,

I radiator adapted to lie closely against the and rendering it capable of furnishing the maximum amount of heat with a given consumption of fuel. Furthermore, by arranging the radiator below the level of the top of the dome or combustion-chamber, as shown, the furnace can be constructed of much less height than usual, and consequently a greater inclination can be given to the hot-air pipes, which is an important consideration, as it f; cilitates the upward passage of the hot air.

9 is an aperture through which access can be had to the interior of the radiator H, to allow of its being cleaned out, this aperture being closed by a door or cap h.

I am aware of Patent No. 231,559, August 24, 1880, and therefore lay no claim to the construction therein shown and described.

' WhatI claim as my invention, and desire to secure by Letters Patent. is

1. In a hot-air furnace. the combination. with the combustionchamber, of an annular outer casins in such manner as to prevent the passage of air between the outer circumference of said radiator and the casing, substantially as and for the purpose hereindescribed.

2. In a hot-air furnace, the combination, with the combustion-chamber A, of the annular radiator H, communicating therewith, and encircling the same below the level of its top, and extending to and lying closely up against the outer casing, G, in such manner as to prevent the passage of air. between the two, and having an annularspace, 0, between .its inner periphery and the combustion chamber, through which all of the upward currents of air are compelled to pass on their way to the hot-air pipes, substantially in the manner and for the purpose described.

\Vitncss my hand this 26th day of March, A. l). 1884. I

BENJAMIN \V. FELTON.

In presence ot' P. E. TESCHEMACHER, \V. .T. CAMBRIDGE. 

